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A roughly 27-million-year-old fossilized skull echoes growing evidence that ancient whales could navigate using high-frequency sound,
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Discovered over a decade ago in a drainage ditch by an amateur fossil hunter on the South Carolina coast, the skull belongs to an early toothed whale. The fossil is so well-preserved that it includes rare inner ear bones similar to those found in modern whales and dolphins. Inspired by the Latin for “echo hunter,” scientists have now named the ancient whale Echovenator sandersi.
“It suggests that the earliest toothed whales could hear high-frequency sounds,” which is essential for echolocation,
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, says Morgan Churchill, an anatomist at the New York Institute of Technology in Old Westbury. Churchill and his colleagues describe the specimen online August 4 in Current Biology,
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Modern whales are divided on the sound spectrum. Toothed whales, such as orcas and porpoises,
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, use high-frequency clicking sounds to sense predators and prey.
Filter-feeding baleen whales,
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, on the other hand,
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, use low-frequency sound for long-distance communication. Around 35 million years ago, the two groups split, and E. sandersi emerged soon after,
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CT scans show that E. sandersi had a few features indicative of ultrasonic hearing in modern whales and dolphins. Most importantly, it had a spiraling inner ear bone

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